Effect of phase separation on the properties of simple glasses I. Density and molar volume

R. R. Shaw, Donald R Uhlmann

Research output: Contribution to journalArticle

77 Citations (Scopus)

Abstract

The variation of bulk density with composition across a miscibility gap is adequately described by a simple model in which volume additivity of the two phases is assumed. The density-weight percent composition function must always have positive (concave-upward) curvature across a two-phase region. The density-mole percent composition function can have either positive or negative curvature, depending upon the location of the miscibility gap in the binary diagram and upon the molecular weights of the end-member oxides. Immiscible composition regions are generally signalled more clearly by simple density-weight percent composition plots than by density-mole percent plots or molar volume or partial molar volume analyses. The model is used to predict possible immiscible regions in the system K2OSiO2, PbOSiO2, B2O3GeO2, SiO2GeO2, PbOGeO2, and PbOP2O5. Immiscibility is probably not present on the GeO2-rich side of the alkali germanate series of glasses. The LiF-rich limit of the miscibility gap in the LiF-BeF2 system is estimated.

Original languageEnglish (US)
Pages (from-to)474-498
Number of pages25
JournalJournal of Non-Crystalline Solids
Volume1
Issue number6
StatePublished - Nov 1969
Externally publishedYes

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Phase separation
Density (specific gravity)
miscibility gap
Glass
Solubility
glass
Chemical analysis
plots
curvature
Alkalies
Oxides
molecular weight
alkalies
solubility
Molecular weight
diagrams
oxides

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites

Cite this

Effect of phase separation on the properties of simple glasses I. Density and molar volume. / Shaw, R. R.; Uhlmann, Donald R.

In: Journal of Non-Crystalline Solids, Vol. 1, No. 6, 11.1969, p. 474-498.

Research output: Contribution to journalArticle

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